Railway car truck



3 Sheets-Sheet l Filed Jan. 29, 1965 July 11, 1967 A. F. BAKER RAILWAY CAR TRUCK 3 Sheets-Sheet 2 Filed Jan. 29, 1965 July 11, 1967 A. F. BAKER RAILWAY CAR TRUCK 3 Sheets-Sheet 5 Filed Jan. 29, 1965 United States Patent O 3,330,224 RAILWAY CAR TRUCK Arthur Fielden Baker, Calumet City, Ill., assigner to Amsted Industries Incorporated, Chicago, Ill., a corporation of New Jersey Filed Jan. 29, 1965, Ser. No. 429,105 3 Claims. (Cl. 10S-197) This invention relates to railway car trucks and more particularly to freight car trucks provided with friction snubbing means to control vertical movement of a bolster relative to the side frames.

Briefly, the present invention contemplates the provision of a railway car truck comprising spaced truss type side frames supported at their ends upon wheel and axle assemblies and interconnected by a bolster which is resiliently supported at its ends upon spring groups seated upon the side frames. The side frames comprise tension and compression members interconnected intermediate their ends by spaced vertical columns to define windows to receive the ends of the bolster. To dampen vertical movements of the bolster, friction shoes are mounted in pockets on the bolster and biassed into frictional engagement against at surfaces on the side frame columns by means of shoe retainer inserts and compression springs.

An object of the present invention resides in the provision of a snubbed railway car truck in which worn friction shoes can readily be removed from their respective pockets lin the bolster and replaced by new shoes without disassembly of the truck.

Another object of the invention resides in the provision of a snubbed railway car truck in which each friction shoe is ldetachably mounted within its bolster pocket by means of two shoe retainer inserts and a helical compression spring.

A further object of the invention resides in the provision of a snubbed railway car ltruck in which the friction shoes, retainer inserts and compression springs are inserted into the bolster pockets and removed therefrom at the upper side of the bolster.

Another object of the invention resides in the provision of a snubbed railway car truck in which the friction shoes are provided with flat vertical friction surfaces and spaced parallel inclined surfaces slidably engaging inclined surfaces on the retainer inserts.

The invention embodies other novel features, details of construction and rarrangement of parts which are hereinafter set forth in the specification and claims and illustrated in the accompanying drawings, forming part thereof, wherein:

FIGURE l is a side elevation, partly in section, showing a railway car truck embodying features of the invention.

FIGURE 2 is a fragmentary top plan view showing a portion of one end of the bolster and the friction snubbing means provided thereon for engagement against a side frame column.

FIGURE 3 is a side elevation of the structure shown in FIGURE 2.

FIGURE 4 is a transverse section taken along the line 4 4 of FIGURE 2, the friction shoe and insert being omitted.

FIGURES 5, 6, 7 and 8 are detail views showing the friction shoe.

FIGURES 9, 10 and 11 are detail views showin-g the shoe retainer insert.

FIGURE 12 is a schematic cross-sectional view illustrating the relationship between the holster friction shoe, the bolster pockets, and the shoe retainer inserts.

Referring now to the drawings for a better understand- :ing of the invention, the railway car truck is shown as comprising spaced truss type side frames 2 supported at their ends upon wheel and axle assemblies 3, each side frame having tension and compression members 4 and 6 interconnected intermediate their ends by spaced vertical columns 7 to Vdefine a window 8. The side frames are interconnected by a ybolster 9 having its ends extending through the windows and provided with inboard and outboard guide lugs 11 and 12 straddling the columns 7. The bolster is resiliently supported at its ends upon spring groups 13 seated upon the tension members.

The bolster 9 is of box section having top and bottom walls 14 and 16 connected by spaced side walls. Friction shoe pockets 18 are provided on the bolster adjacent the columns 7, each pocket being defined by end walls 19 and a back wall 21 extending vertically between and merging with the top and bottom walls 14 and 16. Stop lugs 20 are provided on the back wall 21 adjacent the end walls 19, and inclined flanges 22 are provided on the end walls 19. A spring seat 23 is provided on bottom wall 14 between the end walls 19.

AEach of the friction shoe pockets 18 is provided with a friction shoe 26 which is shown as comprising a hollow metal casting having a flat front surface 27 for frictional engagement against a fiat wear plate 28 secured to a column 7. The shoe is provided with spaced parallel inclined surfaces 29 sloping downwardly from the front surface 27 at an angle of, for example, approximately 37'1/2. Wings 31 are provided on opposite sides of lthe shoe for sliding engagement between the inclined flanges 22 and two identical shoe retainer inserts 32.

As illustrated in FIGURES 9, and 11, the retainer insert 32 comprises a metal casting having an inclined surface '33 complementary to the inclined surfaces 29. The insert 32 is provided with side walls 34 having coplanar vertical back surfaces 36 for abutting engagement against the back wall 21 of the shoe pocket 18. The side walls 34 are provided with coplanar horizontal surfaces 37 for abutting engagement under the stop lugs 20 provided on the back wall 21.

Each shoe 26 is biased upwardly against the inserts 32 and outwardly against the wear plates 28 by means of a compression spring 38 engaged between the spring seat 23 and the top wall 39 of the shoe.

It will be noted that a worn shoe 26 and its spring 38 and inserts 32 may readily be removed from the shoe pocket 18 by iirst forcing the shoe downwardly into the pocket -to permit removal of the inserts, and then removing `the shoe and spring. New parts are assembled within the pocket by forcing the shoe `downwardly to compress the spring, and then mounting the inserts under the stop lugs 20.

I claim:

1. In a railway car truck having a bolster resiliently supported at its ends upon spring groups seated upon spaced side frames provided with spaced vertical columns straddling the ends of the bolster, said bolster having pockets `dened by spaced end walls, a back wall having stop lugs thereon and a bottom wall, shoe retainer inserts mounted within the pockets and having inclined surfaces sloping upwardly toward the columns, said shoe retainer inserts being detachably engaged against said stop lugs on the back walls of the pocket, friction shoes mounted in the pockets and provided with front surfaces engaging the columns and spaced parallel inclined surfaces engaging the inclined surfaces on the inserts, and compression springs sea-ted on the bottom walls and urging the shoes upwardly between the inserts and the columns.

2. A railway car truck according to claim 1 in which each insert engages a back wall and the lower side of a stop lng.

3. A railway car truck according to claim 2 in which two inserts are mounted in each pocket adjacent the side walls thereof.

References Cited UNITED STATES PATENTS 2,257,109 9/1941 Davidson 105-197 2,853,958 9/1958 VNeumann 10s- 197 2,898,870 8/1959 comen 105-197 ARTHUR L. LA POINT, Primm Examiner.

H. BELTRAN, Assistant Examiner. 

1. IN A RAILWAY CAR TRUCK HAVING A BOLSTER RESILIENTLY SUPPORTED AT ITS ENDS UPON SPRING GROUPS SEATED UPON SPACED SIDE FRAMES PROVIDED WITH SPACED VERTICAL COLUMNS STRADDLING THE ENDS OF THE BOLSTER, SAID BOLSTER HAVING POCKETS DEFINED BY SPACED END WALLS, A BACK WALL HAVING STOP LUGS THEREON AND A BOTTOM WALL, SHOE RETAINER INSERTS MOUNTED WITHIN THE POCKETS AND HAVING INCLINED SURFACES SLOPING UPWARDLY TOWARD THE COLUMNS, SAID SHOE RETAINER INSERTS BEING DETACHABLE ENGAGED AGAINST SAID STOP LUGS ON THE BACK WALLS OF THE POCKET, FRICTION SHOES MOUNTED IN THE POCKETS AND PROVIDED WITH FRONT SURFACES ENGAGING THE COLUMNS AND SPACED PARALLEL INCLINED SURFACES ENGAGING THE INCLINED SURFACES ON THE INSERTS, AND COMPRESSION SPRINGS SEATED ON THE BOTTOM WALLS AND URGING THE SHOES UPWARDLY BETWEEN THE INSERTS AND THE COLUMNS. 